diff --git a/experimental/libbox/service_interface.go b/experimental/libbox/service_interface.go
new file mode 100644
index 00000000..b54555fa
--- /dev/null
+++ b/experimental/libbox/service_interface.go
@@ -0,0 +1,23 @@
+package libbox
+
+import (
+	"context"
+
+	box "github.com/sagernet/sing-box"
+	"github.com/sagernet/sing-box/common/urltest"
+	"github.com/sagernet/sing/service/pause"
+)
+
+func NewBoxService(ctx context.Context, cancel context.CancelFunc, instance *box.Box, pauseManager pause.Manager, urlTestHistoryStorage *urltest.HistoryStorage) BoxService {
+	return BoxService{
+		ctx:                   ctx,
+		cancel:                cancel,
+		instance:              instance,
+		pauseManager:          pauseManager,
+		urlTestHistoryStorage: urlTestHistoryStorage,
+	}
+}
+
+func (b *BoxService) GetInstance() *box.Box {
+	return b.instance
+}